銀ぎん河が団だん

noun

galaxy cluster; cluster of galaxies

Technical term in astronomy for a gravitationally bound group of galaxies.

• かみのけ座ざ銀ぎん河が団だんは、地ち球きゅうから約やく3さん億おく光こう年ねん離はなれている。

  The Coma Cluster of galaxies is about 300 million light-years away from Earth.